Rolbiecki , Ryszard, and Krystyna Wojewódzka-Król. “Changes in the Transport Capacity of Polish Inland Waterways Against the Background of European Waterway Use for Transport”. Transport Economics and Logistics 81 (March 12, 2019): 155–164. Accessed April 26, 2024. https://czasopisma.bg.ug.edu.pl/index.php/znetil/article/view/5340.